The valley of Aran is surrounded by mountains that are ...
Where lava from a volcanic mountain forcefully, but not ...
Lake Vostok is the largest of more than 140 subglacial ...
Mauna Loa is one of five volcanoes that form the Island of ...
Piton de la Fournaise is a shield volcano on the eastern ...
The underground river that flows 13,000ft below ground ...
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